Improvement in saw-frames



HENRY s. NHLLER. I Improvement in Saw-Frames.

Patented May 30,1371.

HENRY s. Mnmnaor PHILADELPHIA, PENNSYLVANIA, Assrenon on one HALF HIS RIGHT TO SAMUEL'H- DAVIS, JR., OF SAME PLACE.

IMPROVEMENT IN SAW-FRAMES.

Specification forming part of Letters Patent No. 115,500, dated May 30, 1871.

To all whom it may concern:

. Be it known that I, HENRY S. MILLER, of the city and county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Saw-Frames, and I do hereby declare .the following tobe-a'full, clear,

and exact description of the nature thereof sufficient to enable others skilled in the art to which my invention appertains to fully understand and use the same, reference being had to the accompanying drawing making part of this specification, in whichrelieving the yoke of directstrain.

In the drawing, A and 13 represent the side pieces of the frameof a buck or other saw; 0,

the blade, and D, the tighteningyoke thereof, all of which may be of ordinary form and con- I struction. E E. represent stretchers, which extend from the sidepieces A B, and, in the pres entcase, consist of two arches, the crowns of which faceeach other. I Between these crowns I arrange acurved or other spring, F, the central portion being secured to a pin, G, on the bearing-plate H,against which rest the upper stretchers,the pinpassing through the latter,

I and byineans of suitable flanges said plate is prevented from lateral displacement. J represents the other bearin g-plate, which rests on M the lower stretcher; and against which bear the ends of thespringF. A pin, K, is fixed in the lower stretcher and passes through the plate J, which, by means of flanges formed upon it, is retained in placeand prevented from moving laterally.

When the parts are in position and the yoke tightened, the tendency is to press down the center of the upper stretcher. This bears against the spring, and in return forces down the center of the'lower stretcher, whereby the lower portions of the saw-frame are'pressed apart and the saw-blade is strained. The connection between the stretchers being elastic, all shocks to the frame, owing to knots and other obstacles acting against the saw-teeth, will be broken, and the strain on the yoke greatly eased. There will not be the dead thrusts between parts as where the stretchers are in direct contact, and while in my invention the connection between the stretchers is elastic, the straining of the blade will, nevertheless, be firm and uniform. The saw can be operated with case, since the arms of the sawyer will not receive the full force of blows or shocks from obstacles in the Wood, and thus simplicity, reliability, and practicability are combined in my invention.

I am aware that stretchers have been ap plied to saw-frames, and I am also aware that such stretchers consist of two arches having theircenters or crowns arranged to face each other. Itherefore do not claim such parts;

- but I do claim-- The spring F, as arranged with the stretchers E E of the saw-frame, substantially as and for the'purpose described. 7

The above signed by me this 26th day of April, 1871.

HENRY S. MILLER. v Witnesses:

Joan A. Wmonnsnmar,

A. H. SHOEMAKER. 

